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The TR61 Rear 6-Piston Big Brake Kit is a Racing Series — Circuit caliper engineered for track, time-attack, and endurance use. Monoblock forged aluminum body, six racing pistons without dust boots, and a two-piece directional rotor package built for thermal repeatability and predictable rear brake balance.
The TR61 is a rear-axle race caliper designed to pair with a larger front BBK and give you a tunable rear brake bias. The 6-piston layout uses a staggered bore configuration (27 / 28.5 / 32 mm) to load the pad evenly across its length, reducing taper wear and extending pad life under repeat heavy braking. Piston seals run open (no dust boots) for faster heat rejection and easier service between sessions.
| Brake Caliper | |
|---|---|
| Series | Racing Series — Circuit |
| Model / Application | TR61 |
| Axle Position | Rear |
| Piston Count | 6-piston |
| Piston Type | Racing pistons, no dust boots |
| Piston Diameter | 27 mm × 2, 28.5 mm × 2, 32 mm × 2 |
| Caliper Dimensions | 277.8 × 167.4 × 80.3 mm |
| Total Piston Area | 40.28 cm² per caliper (all pistons combined) |
| Construction | Monoblock forged aluminum |
| Net Weight | 2.90 kg per caliper, without pads |
| Surface Finish | Nickel-plated |
| Recommended Wheel Size | 18 in or larger |
| Recommended Rotor Size | Ø355–380 mm × 32 mm |
| Brake Rotors | |
| Material (Standard) | Heat-treated high-carbon cast iron |
| Material (Option B) | Racing-grade heat-treated high-carbon cast iron |
| Rotor Dimensions | Ø355 or Ø380 mm × 32 mm |
| Construction | Two-piece, internally vented |
| Mounting | Fixed or floating, depending on rotor size and application |
| Directional | Yes — left/right specific |
| Face Pattern (Standard) | Curved slot / Grain Slot / Wave Slot / Drilled & slotted |
| Face Pattern (Option B) | Wave Slot |
| Brake Pads | |
| Compatible Rotors | Iron / steel rotors only |
| Operating Temp (Standard) | 0–600 °C, average μ 0.38 |
| Operating Temp (Option B) | 0–750 °C, average μ 0.45 |
| Brake Lines | |
| Construction | Three-layer reinforced |
| Material | PTFE inner / SUS304 stainless braid / PVC outer |
| Fitment & Installation | |
| Caliper Mounting | Radial mount with vehicle-specific brackets |
| Brake Line Fittings | Vehicle-specific, caliper- and chassis-side |
| Bedding-In | Required before track use |
Choose the pad/rotor package that matches your event profile. Standard handles club days, HPDE, and mixed street/track. Option B is built for higher heat loads — endurance, time-attack, and back-to-back race sessions.
Every TR61 rear kit ships with vehicle-specific radial brackets and braided lines cut to length. Send your chassis details and front BBK setup; we'll spec rotor diameter and pad compound to match your front bias target.
Rear axle. The TR61 is designed to pair with a larger front BBK to set rear brake bias on a track or drift build.
Ø355 × 32 mm or Ø380 × 32 mm, both in two-piece floating or fixed construction depending on the application. We confirm sizing during the fitment review.
Standard uses high-carbon iron rotors with a 0–600 °C pad window (μ 0.38). Option B uses racing-grade iron rotors with Wave Slot face and a 0–750 °C pad window (μ 0.45) for endurance and sustained heat.
Minimum 18-inch wheels. Wheel spoke profile and offset still matter — send wheel specs and we'll confirm clearance before production.
The TR61 uses racing pistons without dust boots and race pad compounds. It's intended for motorsport and track use. For street/track dual-use, ask about pad compound options.
Yes. Proper bed-in is required before hard use to transfer pad material and stabilize the friction surface. Instructions ship with the kit.
Talk to our brake engineers about rotor size, pad compound, and front/rear bias matching for your build.
You’re here because you’re passionate about your ride, and so are we. We want your TTSPORT brake upgrade to be a total win. Here’s some straight talk to make sure everything goes smoothly, from fitment to bedding in.
Look, we know you get it. Your brake kit is custom-made for your specific car. That means once it's built, it's yours. We can only accept returns if there’s a genuine quality defect from our side.
Sometimes, aftermarket wheels can be tricky. Depending on the design, you might need spacers for clearance. We’ll do our best to help you figure it out, but issues related to wheel spacers don't qualify for a return.
To get this right the first time, we need your help. Before you order, please give us the following info:
We’ll likely ask you to confirm some measurements and send a few photos of your wheels. Please double-check everything you send us. TTSPORT isn't responsible for fitment issues if the specs you provided were off.
We check every single part before it leaves our shop. When your kit arrives, give it a good look-over. If you spot any potential quality issues, let us know within 24 hours.
This is key to awesome performance. Don't skip it.
We build our kits to last, and we stand by our work. Here’s the breakdown:
Recommended Service Intervals:
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